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Reserves for Insurance Claims and Claim Expenses - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
USD ($)
policy
claim
loan
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
policy
Dec. 31, 2023
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total gross liability for unpaid claims and claim adjustment expenses $ 180,347 $ 135,520 $ 152,071 $ 123,974
Number of claims paid | claim 281      
Claims paid, including amounts covered by insurance $ 16,100      
Primary loans in default | loan 7,093   6,642  
Primary insured portfolio, loan default rate (in percent) 1.05%   1.01%  
Total number of policies in-force | policy 677,010   659,567  
Favorable development on prior year defaults $ 52,400 $ 57,200    
Reserve for prior year insurance claims and claim expenses $ 70,600      
Reinsurance Policy, Type [Axis]: QSR Transactions        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Number of covered claims included in number of claims paid | claim | claim 271      
Component of claims paid covered under QSR Transaction $ 3,200